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abstract, ammonia, background, boiler, business, chemistry, consumption, counter, current, electric, electricity, energy, engineering, equipment, factory, fuel, gage, gas, gauge, hydrogen, industrial, industry, machine, manufacturing, measure, measurement, meter, metering, oil, pairs, petroleum, pipe, pipeline, piping, power, pressure, production, pump, refinery, room, smart, stainless, structure, supply, technology, tube, utility, valve, water,